ZHEKOV, Z. Visir optic appliances designed for observation on the board of spaceships. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 1, n. 1, p. 109–113, 2023. DOI: 10.46687/jsar.v1i1.26. Disponível em: https://jsar.ftn.shu.bg/index.php/jsar/article/view/26. Acesso em: 7 nov. 2024.